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Darbe Yükü Altındaki Hibrit Kompozit Plakalara Sıcaklığın Etkisi

Temperature Effects on Hybrid Composite Plates Under Impact Loads

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Abstract (2. Language): 
In this work, impact responses of carbon-glass fiber/epoxy (hybrid) composites were investigated under various temperatures and increasing impact energies. The increasing impact energies were applied to the specimens at various temperatures as -20, 0, 20 and 40oC until perforation took place of specimens. Those specimens are composed by two types of fiber orientation with eight laminates hybrid composites. An Energy profiling diagram, used for showing the relationship between impact and absorbed energy, has been used to obtain penetration and perforation thresholds of hybrid composites. Beside those, temperature effects on impact characteristics such as maximum contact force (Fmax), total deflection (d) and maximum contact duration (t) were also presented in figures. Finally, glass and carbon fibers exhibited more brittle characteristics at -20 oC according to other temperatures. So, perforation threshold of each hybrid composites at -20oC was found higher than other temperatures.
Abstract (Original Language): 
Bu çalışmada, karbon-cam elyaf/epoksi (hibrit) kompozitlerin sıcaklık ve artan darbe enerjisi altındaki darbe davranışları incelenmiştir. Bununla ilgili olarak iki tip tabaka dizilim açısına sahip, 8 tabakalı hibrit kompozit numunelere -20, 0, 20 ve 40 oC sıcaklıklarında, numunelerde delinme meydana gelene kadar darbe enerjisi uygulanmıştır. Hibrit kompozitlerin saplanma ve delinme sınır değerleri¬nin belirlenmesinde, darbe enerjisi ve absorbe edilen enerji arasındaki ilişkiyi göstermede kullanılan enerji profili diyagramı kullanılmıştır. Bunun yanı sıra, maksimum temas kuvveti (Fmax), toplam çökme (d) ve maksimum temas süresi (t) gibi önemli darbe karakteristiklerinin sıcaklık geçişlerindeki deği¬şimleri de sunulmuştur. Sonuç olarak, cam ve karbon fiberlerin -20 oC'de, diğer sıcaklıklara göre daha çok gevrekleştiği görülmüştür. Buna göre her iki tip hibrit kompozit için -20 oC'de meydana gelen de¬linme sınırı diğer sıcaklıklara göre en yüksek değerde bulunmuştur.
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